Dtc B1242 Wireless Door Lock Tuner Circuit Malfunction

Vehicle Interior. Corolla. Zre142 Aze141
Door Lock. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOOR CONTROL RECEIVER)

CHECK HARNESS AND CONNECTOR (BATTERY, BODY GROUND)

REPLACE DOOR CONTROL RECEIVER

REGISTER RECOGNITION CODE

CONFIRM DTC

DTC B1242 Wireless Door Lock Tuner Circuit Malfunction


DESCRIPTION

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU.

DTC No.
DTC Detection Condition
Trouble Area
B1242
In diagnostic mode, an applicable RDA signal cannot be received within 2.4 second after an PRG signal has been output from the main body ECU.
  1. Wire harness or connector
  2. Door control receiver
  3. Main body ECU (Instrument panel junction block)

WIRING DIAGRAM


Corolla. Zre142 Aze141.Door Lock.Power Door Lock Control System. Dtc B1242 Wireless Door Lock Tuner Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOOR CONTROL RECEIVER)


    Corolla. Zre142 Aze141.Door Lock.Power Door Lock Control System. Dtc B1242 Wireless Door Lock Tuner Circuit Malfunction

  1. Disconnect the E61 main body ECU connector and the M12 door control receiver connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E61-16 (RDA) - M12-2 (RDA)
    		Always
    		Below 1 Ω
    E61-16 (RDA) - Body ground
    		Always
    		10 kΩ or higher
    E61-17 (PRG) - M12-3 (PRG)
    		Always
    		Below 1 Ω
    E61-17 (PRG) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (BATTERY, BODY GROUND)


    Corolla. Zre142 Aze141.Door Lock.Power Door Lock Control System. Dtc B1242 Wireless Door Lock Tuner Circuit Malfunction

  1. Measure the voltage and resistance according to the value(s) in the table below.

    Standard:
    Tester Connection
    		Condition
    		Specified Condition
    M12-1 (GND) - Body ground
    		Always
    		Below 1 Ω
    M12-5 (+B) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.REPLACE DOOR CONTROL RECEIVER

  1. Temporarily replace the door lock control receiver with a new or known good one (COROLLA_ZRE142 RM0000030UM01FX.html).


NEXT


4.REGISTER RECOGNITION CODE

  1. Perform the Registration procedure (COROLLA_ZRE142 RM0000023D303HX.html).


NEXT


5.CONFIRM DTC

  1. Clear the DTCs (COROLLA_ZRE142 RM000001NN6039X.html).

  1. Check if the same DTC is detected.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B


B
REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
A

END (DOOR CONTROL RECEIVER IS DEFECTIVE)